#1 classify v. [class, sort, assort, sort out, separate] arrange or order by classes or categories; "How would you classify these pottery shards--are they prehistoric?". wn
#2 classify v. declare unavailable, as for security reasons; "Classify these documents". wn
#3 classify v. [relegate] assign to a class or kind; "How should algae be classified?"; "People argue about how to relegate certain mushrooms". wn
vizzz